Interestingly, for some reason while trying to access this from the UK I get the following message (which I've never seen before):

Dear Customer,

We have a legal obligation and a responsibility to ensure that our subscribers are not able to reach sites which are barred by law or that are likely to cause malicious damage to their online reputation or devices.

You have tried to access a site at https://gpt4all.io/index.html which we consider to be harmful.

If you consider this to be incorrect and need access to this site, please contact us on address team@internetty.uk or call us on 0333 102 0000 or visit https://www.internetty.uk and we will review our policy for the site.

We apologise for any inconvenience that this restriction may cause you but wish to assure you that we are constantly reviewing threats on the internet to ensure that all our subscribers remain safe.